Imaging lens and imaging apparatus

Abstract

The imaging lens consists of, in order from an object side, a positive first lens group and a positive second lens group. During focusing, the first lens group does not move and the second lens group moves. First and second lenses from an object side in the first lens group are a negative lens. The second lens group consists of a stop disposed on the most object side, two negative lenses, and three or four positive lenses. A lens on the most object side of the second lens group is a negative lens. A lens on the most image side of the second lens group is a positive lens. Predetermined conditional expressions are satisfied.

What is claimed is: 
     
       1. An imaging lens consisting of, in order from an object side to an image side:
 a first lens group having a positive refractive power, which is fixed with respect to an image plane during focusing; and 
 a second lens group having a positive refractive power, which moves along an optical axis during focusing, 
 wherein the first lens group comprises two negative lenses in consecutive order from the most object side to the image side, 
 the second lens group consists of a stop, two negative lenses, and three or four positive lenses, 
 the stop is disposed on the most object side of the second lens group, 
 a lens on the most object side of the second lens group is a negative lens, 
 a lens on the most image side of the second lens group is a positive lens, and 
 in a case where, in a state of focusing on the object at infinity, a distance from an image side principal point of the first lens group, as a reference, to an object side principal point of the second lens group is dH12, a focal length of the first lens group is f1, a distance in an optical axis direction from the object side principal point of the second lens group, as a reference, to the stop is dSt, a focal length of the second lens group is f2, a focal length of the positive lens on the most image side is fp, and regarding dH12 and dSt, each sign of a distance from the reference to the image side is positive and each sign of a distance from the reference to the object side is negative, Conditional Expressions (1), (2) and (3) are satisfied, which are represented by
   −2< dH 12/ f 1<0.5   (1)
 
   −1< dSt/f 2<−0.6   (2)
 
   0.4< f 2/ fp< 0.8   (3).
 
 
 
     
     
       2. The imaging lens according to  claim 1 ,
 wherein, in a case where a focal length of the imaging lens in a state of focusing on the object at infinity is f, Conditional Expression (4) is satisfied, which is represented by
   0< f/f 1<0.5   (4).
 
 
 
     
     
       3. The imaging lens according to  claim 1 ,
 wherein, in a case where a distance on the optical axis from a lens surface on the most object side of the first lens group to a lens surface on the most image side of the first lens group is dG1, Conditional Expression (5) is satisfied, which is represented by
   0.5< dG 1/ f 1<1.5   (5).
 
 
 
     
     
       4. The imaging lens according to  claim 1 ,
 wherein the number of lenses configuring the first lens group is four or more and six or less. 
 
     
     
       5. The imaging lens according to  claim 1 ,
 wherein, in a case where a refractive index of the negative lens on the most object side of the first lens group with respect to d line is n11 and a refractive index of a second negative lens from the object side of the first lens group with respect to d line is n12, Conditional Expression (6) is satisfied, which is represented by
   1.6<( n 11 +n 12)/2<2   (6).
 
 
 
     
     
       6. The imaging lens according to  claim 1 ,
 wherein, in a case where a refractive index of the negative lens on the most object side of the second lens group with respect to d line is n21, Conditional Expression (7) is satisfied, which is represented by
   1.6< n 21<2   (7).
 
 
 
     
     
       7. The imaging lens according to  claim 1 ,
 wherein, in a case where a radius of curvature of a lens surface on the most image side of the first lens group is rf and a radius of curvature of a lens surface on the most object side of the second lens group is rr, Conditional Expression (8) is satisfied, which is represented by
   −0.5<( rf−rr )/( rf+rr )<2.5   (8).
 
 
 
     
     
       8. The imaging lens according to  claim 1 ,
 wherein Conditional Expression (1-1) is satisfied, which is represented by
   −1.5< dH 12/ f 1<0.2   (1-1).
 
 
 
     
     
       9. The imaging lens according to  claim 1 ,
 wherein Conditional Expression (2-1) is satisfied, which is represented by
   −0.8< dSt/f 2<−0.7   (2-1).
 
 
 
     
     
       10. The imaging lens according to  claim 1 ,
 wherein Conditional Expression (3-1) is satisfied, which is represented by
   0.42< f 2/ fp< 0.72   (3-1).
 
 
 
     
     
       11. The imaging lens according to  claim 2 ,
 wherein Conditional Expression (4-1) is satisfied, which is represented by
   0.25< f/f 1<0.45   (4-1).
 
 
 
     
     
       12. The imaging lens according to  claim 3 ,
 wherein Conditional Expression (5-1) is satisfied, which is represented by
   0.55< dG 1/ f 1<1.3   (5-1).
 
 
 
     
     
       13. The imaging lens according to  claim 5 ,
 wherein Conditional Expression (6-1) is satisfied, which is represented by
   1.65<( n 11 +n 12)/2<1.98   (6-1).
 
 
 
     
     
       14. The imaging lens according to  claim 6 ,
 wherein Conditional Expression (7-1) is satisfied, which is represented by
   1.65< n 21<1.96   (7-1).
 
 
 
     
     
       15. The imaging lens according to  claim 7 ,
 wherein Conditional Expression (8-1) is satisfied, which is represented by
   −0.4<( rf−rr )/( rf+rr )<2.2   (8-1).
 
 
 
     
     
       16. An imaging apparatus comprising the imaging lens according to  claim 1 .